Display holder for a cap



FIG. 1 is a top plan view of a display holder for a cap showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a bottom plan view;

FIG. 4 is a side elevational view; and

FIG. 5 is a rear elevational view thereof.

The dash-dot lines seen in FIG. 2 are printed on the holder. 

The ornamental design for a display holder for a cap, substantially as shown and described. 